Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 885 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 663 + 214 = 874 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 31 × 32 = 992 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 318 + 332 = 650 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 561 + 123 = 684 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 29 × 49 = 1423 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 83 × 24 = 1992 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 968 + 529 = 1497 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 70 × 20 = 1407 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 809 + 648 = 1457 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 16 × 65 = 1040 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 677 + 726 = 1403 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 375 + 169 = 544 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 351 + 332 = 683 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 31 × 60 = 1860 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 88 × 34 = 3000 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 930 + 302 = 1226 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 44 × 94 = 4145 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 41 × 40 = 1640 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 49 × 85 = 4165 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 84 × 39 = 3273 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 28 × 19 = 532 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 899 + 754 = 1653 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 370 + 993 = 1363 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 156 + 452 = 608 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 21 × 79 = 1659 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 972 + 167 = 1139 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 80 × 30 = 2392 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 18 × 46 = 828 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 740 + 359 = 1099 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 83 × 16 = 1328 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 32 × 53 = 1692 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 330 + 733 = 1069 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 775 + 365 = 1140 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 565 + 300 = 865 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 16 × 68 = 1095 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 926 + 856 = 1786 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 83 × 46 = 3818 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 97 × 22 = 2134 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 455 + 302 = 763 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 86 × 36 = 3096 right or wrong? (a) Right (b) Wrong

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